Galvanized Steel: Galvanized steel has more strength than aluminum. It is much heavier in the equivalence of the aluminum gauge size. Popular in mountain areas with a lot of snow. Cost lower than the other metals. Large variety of colors.
Copper: Considered top of the range metal for guttering systems. Very durable and with high strength quality. Does not need to be painted. With time it changes its surface color, but can also be done technically. Most expensive metal in comparison with the above metals. Preferred to be installed by a skillful contractor.